diff --git a/django/db/models/fields/__init__.py b/django/db/models/fields/__init__.py
index 78f75aea35..439633c45f 100644
--- a/django/db/models/fields/__init__.py
+++ b/django/db/models/fields/__init__.py
@@ -477,6 +477,8 @@ class AutoField(Field):
 class BooleanField(Field):
     def __init__(self, *args, **kwargs):
         kwargs['blank'] = True
+        if 'default' not in kwargs and not kwargs.get('null'):
+            kwargs['default'] = False
         Field.__init__(self, *args, **kwargs)
 
     def get_internal_type(self):